Adverting vs Marketing jobs

After looking more deeply into the advertising industry, I realised there are major issues out there. First of all, entry level jobs are very badly paid. Sometimes much less than a secretary. This is because so many people want to break into that industry.
The second issue is that the average working hours are about 50 to 70 hours a week for account executive type jobs and you may be asked to worked on WE wo catch up with work to meet deadlines, etc.
If earning not too much while learning the job isn't a big issue for me. The addition of working like a dog for long hours and not be rewarded financially may be a problem. I need to figure out how quickly people get promoted and how is the workload at later stage.
I reaally love advertising and I think account management is something I'd really enjoy doing but not earning enough and not have enough free time to enjoy life outside work is not very appealing.

Marketing jobs are more like typical office jobs in the workload and salary range. I could hope being hired and earned the same or above what I earned prior my MBA and have a nice between work and leisure. Also, I like Marketing as well. However, most marketing required a few years of experience to start.

So maybe, I should just start in advertising as an account executive, learned all about it and see if I like the job, the pay and the workload. If I don't, then I could always switch to Marketing jobs because I would have some valuable advertising experience with me. The key now is to start in one of the leading Advertising agencies so this will be very valuable for my references as well as the training I'll get and the opportunities to move abroad if needed.

Today, I'm preparing my application for Ogilvy in London.